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1. www2.psych.purdue.edu › ~gfrancis › ClassesPSY 201: Statistics in Psychology - psych.purdue.edu

   www2.psych.purdue.edu › ~gfrancis › Classes

   SINGLE EVENTS. precise de nition requires high-level mathematics intuitive de nition is that probability of a single event is the ratio of the number of possible outcomes that include the event to the total number of possible outcomes.

2. probability.infarom.ro › 9738752000sampleUNDERSTANDING AND CALCULATING THE ODDS - Infarom

   probability.infarom.ro › 9738752000sample

   This simplistic dictionary definition of the probable quality attached to an event is unanimously accepted in current speech. Far from standing for a rigorous definition, this enunciation still gives evidence for the quantitative and measurement aspect of the probability concept because the chance of an event occurring is

3. sites.pitt.edu › ~bertsch › riskUnderstanding Relative Risk, Odds Ratio, and Related Terms:

   sites.pitt.edu › ~bertsch › risk

   The absolute risk is the probability of an event in a sample or population of interest. The relative risk (RR) is the risk of the event in an experimental group relative to that in a control group. The odds ratio (OR) is the odds of an event in an experimental group relative to that in a control group.

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4. open.maricopa.edu › chapter › chapter-7-probabilityChapter 7: Probability – Introduction to Statistics for ...

   open.maricopa.edu › chapter › chapter-7-probability

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   To summarize, the probability that an event happens is the number of outcomes that qualify as that event (i.e. the number of ways the event could happen) compared to the total number of outcomes (i.e. how many things are possible).

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5. online210.psych.wisc.edu › wp-content › uploadsThe Gambler’s Fallacy: On the Danger of Misunderstanding ...

   online210.psych.wisc.edu › wp-content › uploads

   For example, to see how the gambler’s fallacy affects people, consider a situation where we just rolled a pair of dice, which both land on 6. The odds of this happening in a fair dice roll are 1/36, since the odds of each die landing on a 6 are 1/6. Here, the gambler’s fallacy could cause someone to assume that the odds

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6. ocw.mit.edu › courses › 9-07-statistics-for-brain9.07 Introduction to Probability and Statistics for Brain and ...

   ocw.mit.edu › courses › 9-07-statistics-for-brain

   I. Objectives Introduce the basic concepts of probability theory. Introduce the basic axioms and rules of probability theory. Learn to perform probability computations using counting methods. Understand conditional probability and Bayes’ rule.

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   What is the probability that an event happens?

   • To summarize, the probability that an event happens is the number of outcomes that qualify as that event (i.e. the number of ways the event could happen) compared to the total number of outcomes (i.e. how many things are possible).

   Chapter 7: Probability – Introduction to Statistics for Psychology

   open.maricopa.edu/psy230mm/chapter/chapter-7-probability/

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   What does probability mean in statistics?

   • In statistics, we usually define probability as the expected relative frequency of a particular outcome. The relative frequency is the number of times an event takes place relative to the number of times it could have taken place. Let’s look at a slightly deeper example before we learn a basic probability formula.

   Chapter 7: Probability – Introduction to Statistics for Psychology

   open.maricopa.edu/psy230mm/chapter/chapter-7-probability/

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   How do you calculate the probability of an event?

   • To calculate the probability of an event, which here is defined as rolling a 1 on an unbiased die, we need to know two things: how many outcomes satisfy the criteria of our event (stated different, how many outcomes would count as what we are looking for) and the total number of outcomes possible.

   Chapter 7: Probability – Introduction to Statistics for Psychology

   open.maricopa.edu/psy230mm/chapter/chapter-7-probability/

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   What is an odds ratio?

   • An odds ratio is an example of what we will later call an effect size, which is a way of quantifying how relatively large any particular statistical effect is. A final point relates to how probabilities have been interpreted. Historically, there have been two different ways that probabilities have been interpreted.

   Chapter 7: Probability – Introduction to Statistics for Psychology

   open.maricopa.edu/psy230mm/chapter/chapter-7-probability/

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   Can the probability of an event be greater than one?

   • The probability of any individual event cannot be greater than one. This is implied by the previous point; since they must sum to one, and they can’t be negative, then any particular probability cannot exceed one.

   Chapter 7: Probability – Introduction to Statistics for Psychology

   open.maricopa.edu/psy230mm/chapter/chapter-7-probability/

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   What is an example of a classical interpretation of probability?

   • B. The Classical Interpretation of Probability. This concept of probability is based on the notion of equally likely outcomes. For example, in a coin toss there are two outcomes: a heads or a tail. If the outcomes are equally likely to occur then each must have probability of 1⁄2.

   9.07 Introduction to Probability and Statistics for Brain and Cognitive

   ocw.mit.edu/courses/9-07-statistics-for-brain-and-cognitive-science-fall-2016/c253650367960f524be6611392e79c53_MIT9_07F16_lec1.pdf

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8. open.umn.edu › opentextbooks › textbooksIntroduction to Statistics in the Psychological Sciences

   open.umn.edu › opentextbooks › textbooks

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   May 16, 2019 · The organization is clear and logical, following the format of most psychological statistics texts. Navigation through the textbook is simple. There is a list of highlighted terms at the beginning of each chapter which are correctly linked to their discussion in the text.